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- W2983516404 abstract "Abstract Oxidation of ammonia (NH4+/NH3) from wastewater is a challenge due to its high stability and solubility in aqueous environments. A simple Ag2O/TiO2 (P25) catalyst was synthesized and used for photocatalytic oxidation of aqueous NH4+/NH3. Under UV illumination, the oxidation rate of NH4+/NH3 by 1% Ag2O/P25 is increased with increasing pHs, with a rate constant of 0.383 h−1 at pH 11.8. OH/h+ are important oxidative species that dominate the oxidation of NH4+/NH3. The respective contributions of Pathway I (the h+ mediated process) and Pathway II (the e− mediated process) are 66.2% and 33.8% to the oxidation of NH4+/NH3. Oxidation selectivity toward N2 is more favorable under high concentrations of NH4+/NH3 and low concentrations of Ag2O/P25. The improved separation of e−-h+ pairs on Ag2O/P25 facilitates generation of OH and h+, thus triggering the high conversion yield of NH4+/NH3. XPS analysis further suggests that Ag(I), instead of the photogenerated Ag(0), plays the predominant role in photocatalytic oxidation of NH4+/NH3. This work enriches our understanding on the photooxidation mechanism of NH4+/NH3 by Ag2O/P25." @default.
- W2983516404 created "2019-11-22" @default.
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- W2983516404 date "2020-02-01" @default.
- W2983516404 modified "2023-10-17" @default.
- W2983516404 title "Photocatalytic oxidation of aqueous ammonia by Ag2O/TiO2 (P25): New insights into selectivity and contributions of different oxidative species" @default.
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- W2983516404 doi "https://doi.org/10.1016/j.apsusc.2019.144433" @default.
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